The Firestone tires are designed for colder temperatures, but they do not incorporate a special ice compound. The Blizzak WS70 has rubber compounding that is designed for ICE. When your tire rotates on th ice, it melts the ice and creates a layer of water between the rubber and the ice. The Blizzak has a tubular multicell compound that looks like Swiss cheese under a microscope to allows water to "wick" into the tread so the rubber can make contact with the ice.

That is how you do it! Every major tire manufacturer has attempted to replicate this method, some better than others. The point though, is that a Studless Ice and Snow tire is specifically for ice. They provide the most traction for the worst situations! See what is available for your vehicle.